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Record: 71951 (21/04/2026)
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LNWR/LMS Webb "Iron Duke" Class 4-4-0
Class Types
| LNWR Class |
Iron Duke |
General
| Designer |
Francis Webb |
| Introduced |
1897 |
| Pre-Grouping Company |
London and North Western Railway |
| Grouping Company |
London, Midland & Scottish Railway |
| Wheel Arrangement |
4-4-0 |
| Number Built as Iron Duke |
2 |
| Conversions to other classes |
2 |
| First in Service |
06/1897 |
| Last in Service |
05/1898 |
| Manufacturers |
|
| Orders |
|
| Historical Data |
Webb built 2 4-4-0 locomotives for comparison purposes. The first was a four cylinder simple but the second was a four cylinder compound with 2 low pressure cylinders between the frames. They were quickly both rebuilt to a new specification as 4 cylinder compounds with larger low pressure cylinders and higher boiler pressure. The first engine was renamed Jubilee and became the prototype of the Jubilee class.
Later in their career they were both rebuilt again by George Whale into 2 cylinder simple 4-4-0 Renown class. |
|
|
|
Power
|
Simple |
Compound |
| Variant Introduced |
1897 |
1897 |
| Miscellaneous Differences |
4 cylinder simple |
4 cylinder compound |
| Inside Cylinders |
19.5" x 24" (2 off) |
15" x 24" (2 off) |
| Inside Valves |
Piston |
Piston |
| Inside Motion |
|
Joy |
| Outside Cylinders |
19.5" x 24" (2 off) |
19.5" x 24" (2 off) |
| Outside Valves |
Slide |
Slide |
| Outside Motion |
Joy |
Joy |
Wheels
|
Simple |
Compound |
| Pony |
3' 9" |
As Simple |
| Drivers |
7' 1" |
As Simple |
| Locomotive Wheelbase |
26' 41⁄4" |
As Simple |
| Descriptive Wheelbase |
6' 3" + 10' 4½" + 9' 8¾" = 26' 4¼" (engine only)
|
As Simple |
Boiler & Firebox
|
Simple |
Compound |
| Boiler Diagram |
? |
As Simple |
| Boiler Max Diameter |
4' 27⁄8" |
As Simple |
| Boiler Barrel Length |
11' |
As Simple |
| Boiler Pressure |
175lbs |
As Simple |
| Total Heating Area |
1400.4ft2 |
As Simple |
|